JP7243408B2 - Decorative sheets and modules - Google Patents

Description

The present disclosure relates to a decorative sheet and a module using the same.

A technique is known in which a visible shape of a point light source (a shape visible by a viewer) is decorated by placing a cover (for example, a decorative sheet) between a point light source such as an LED light source and the viewer. there is For example, Patent Literature 1 discloses a cover body having a light-transmitting portion that transmits light, and a real image of light by refracting, dispersing, diffusing, or converging light emitted from a light-emitting portion. A lighting cover is disclosed that includes a contoured shaped sheet that forms a . The purpose of this technology is to obtain a desired beautiful light emission state in lighting for brightening the surroundings, lighting for amusement, and the like.

Japanese Patent Application Laid-Open No. 2012-79600

For example, Patent Literature 1 discloses that a shaping sheet has unevenness in which a large number of triangular pyramids are arranged closely. In order to decorate the visible shape of the point light source, it is necessary to make the uneven pattern finer. In general, the finer the concave-convex pattern, the more likely defects will occur in the concave-convex pattern.

The present disclosure has been made in view of the above circumstances, and a main object of the present disclosure is to provide a decorative sheet with few defects in the concave-convex pattern.

In the present disclosure, a decorative sheet having transparency includes a substrate and unevenness having, on the surface thereof, a group of unit pixel portions located on one side of the substrate and having a plurality of unit pixel portions arranged thereon. a layer, wherein the unit pixel portion has an uneven pattern in which line-shaped protrusions and recesses are alternately arranged; and a second unit pixel portion having the concave-convex pattern extending along a second axis; To provide a decorative sheet whose axes are crossed.

In addition, the present disclosure provides a module including the decorative sheet described above and a point light source arranged with a space between the decorative sheet.

The decorative sheet according to the present disclosure has the effect of having few defects in the concave-convex pattern.

1 is a schematic diagram illustrating a decorative sheet according to the present disclosure; FIG. FIG. 4 is a schematic diagram illustrating part of a unit pixel portion group in the present disclosure; FIG. 4 is a schematic cross-sectional view illustrating an uneven pattern in the present disclosure; FIG. 4 is a schematic cross-sectional view illustrating an uneven pattern in the present disclosure; FIG. 4 is a schematic plan view illustrating part of a unit pixel section group in the present disclosure; FIG. 4 is a schematic plan view illustrating part of a unit pixel section group in the present disclosure; FIG. 4 is a schematic plan view illustrating part of a unit pixel section group in the present disclosure; FIG. 4 is a schematic plan view illustrating part of a unit pixel section group in the present disclosure; FIG. 4 is a schematic plan view illustrating part of a unit pixel section group in the present disclosure; 1 is a schematic cross-sectional view illustrating a decorative sheet according to the present disclosure; FIG. 1 is a schematic cross-sectional view illustrating a module in the present disclosure; FIG. 3 is a schematic plan view showing a concave-convex pattern in Comparative Example 1. FIG.

Embodiments of the present disclosure will be described below with reference to the drawings and the like. However, the present disclosure can be embodied in many different modes and should not be construed as limited to the description of the embodiments exemplified below. In addition, in order to make the description clearer, the drawings may schematically show the width, thickness, shape, etc. of each part compared to the actual form, but this is only an example, and the interpretation in the present disclosure is limited. not something to do. In addition, in this specification and each figure, the same reference numerals may be given to the same elements as those described above with respect to the existing figures, and detailed description thereof may be omitted as appropriate.

In this specification, when expressing a mode of arranging another member on top of a certain member, when simply describing “above” or “below”, unless otherwise specified, 2 includes both cases in which another member is arranged directly above or directly below, and cases in which another member is arranged above or below a certain member via another member. Similarly, in this specification, when describing "on the surface side of a certain member", unless otherwise specified, when another member is arranged directly so as to be in contact with the surface of a certain member It shall include both the case where another member is arranged through another member on the surface of the

A. Decorative Sheet FIGS. 1(a) and 1(b) are a schematic cross-sectional view and a schematic plan view illustrating a decorative sheet according to the present disclosure. Also, FIG. 2(a) is an enlarged plan view of part of the unit pixel portion group, and corresponds to an enlarged view of the Z portion in FIG. 1(b). FIG. 2(b) is a cross-sectional view taken along line XX of FIG. 2(a), which is a schematic cross-sectional view of a unit pixel portion.

The decorative sheet 10 shown in FIGS. 1 and 2 includes a base material 1 and a concavo-convex layer having, on the surface thereof, a group of unit pixel portions located on one side of the base material 1 and having a plurality of unit pixel portions 11 arranged thereon. 2. The unit pixel portion 11 has an uneven pattern in which line-shaped convex portions and concave portions are alternately arranged. The concave-convex pattern 111 is formed by alternately arranging a plurality of concave portions 111a having a line-like shape in plan view and a plurality of convex portions 111b having a line-like shape in plan view with the longitudinal direction thereof being the same. . In FIG. 2(b), a concavo-convex pattern composed of four concave portions 111a (111a ₁ to 111a ₄ ) and four convex portions 111b (111b ₁ to 111b ₄ ) in total is formed. .

The unit pixel portion group includes, as the unit pixel portion 11, a first unit pixel portion 11A having an uneven pattern 111A extending along the first axis _LA , and an uneven pattern 111A extending along the second axis _LB. and a second unit pixel portion 11B having 111B, and the first axis _LA and the second axis _LB are in an intersecting relationship.

According to the present disclosure, by using a plurality of unit pixel portions including the first unit pixel portion and the second unit pixel portion, the size of the unit pixel portion can be relatively increased. A decorative sheet with few defects can be obtained. For example, Patent Literature 1 discloses that a shaping sheet has unevenness in which a large number of triangular pyramids are arranged closely. In Patent Document 1, since each triangular pyramid directly contributes to the diffraction and interference of light, in order to decorate the visible shape of the point light source, it is necessary to make the shape of each triangular pyramid (concavo-convex pattern) fine. be. In general, the finer the concave-convex pattern, the more likely defects will occur in the concave-convex pattern.

In contrast, in the present disclosure, a first unit pixel portion having an uneven pattern extending along a first axis and a second unit pixel portion having an uneven pattern extending along a second axis are used. Further, by arranging the first axis and the second axis so as to have an intersecting relationship, the visible shape of the point light source is decorated. That is, the size of the unit pixel portion can be relatively increased because the visible shape of the point light source is decorated not by one unit pixel portion but by a plurality of unit pixel portions. As a result, it is possible to obtain a decorative sheet with few defects in the concave-convex pattern. Moreover, since the size of the unit pixel portion can be relatively increased, the durability of the decorative sheet is also improved.

Furthermore, in the present disclosure, in order to decorate the visible shape of the point light source not by one unit pixel portion but by a plurality of unit pixel portions, for example, the decorative shape of the point light source is in the planar direction (direction perpendicular to the thickness). A continuously changing decorative sheet can be easily obtained. For example, Patent Document 1 describes a shaped sheet having unevenness in which a large number of triangular pyramids are arranged densely. A transfer master having Cutting is typically used as a method of forming a regular concave-convex pattern on a transfer original plate. Cutting is good at forming a regular uneven pattern over a wide area, but it is difficult to form a uneven pattern in which the decorative shape of the point light source changes continuously in the surface direction (direction perpendicular to the thickness). It is difficult.

1. Concavo-convex layer The concavo-convex layer in the present disclosure is a layer that is located on one side of the base material and has on its surface a group of unit pixel portions in which a plurality of unit pixel portions are arranged. In addition, the uneven layer has transparency to the extent that light from a point light source can be visually recognized.

(1) Unit pixel portion group A unit pixel portion group is configured by arranging a plurality of unit pixel portions.

(i) Unit Pixel Portion The unit pixel portion has an uneven pattern in which linear protrusions and recesses are alternately arranged. The planar shape of the protrusions and recesses is usually linear (straight). Examples of cross-sectional shapes of the protrusions and recesses include rectangles such as squares and rectangles, trapezoids, triangles, semicircles, parabolas, bells, and hyperbolas. The cross-sectional shape of the protrusion and the recess may be the same or different. FIGS. 3A to 3E are schematic diagrams showing examples of cross-sectional shapes of uneven patterns in a direction perpendicular to the longitudinal direction.

In addition, the cross-sectional shape in the direction perpendicular to the longitudinal direction of the uneven pattern is determined according to the cross-sectional shape of the alternately arranged protrusions and recesses, for example, square wave, trapezoidal wave, sinusoidal wave, triangular wave, sawtooth wave. waves. The tops of the protrusions or the bottoms of the recesses of the uneven pattern may be flat, pointed, or curved.

Further, as shown in FIG. 4( a ), the uneven pattern 111 has the bottoms of the recesses 111 a lying in the same plane as the surface S of the uneven layer 2 , and the tops of the protrusions 111 b extending from the surface S of the uneven layer 2 . may be positioned upward in the thickness direction. Moreover, as shown in FIG. 4(b), the tops of the protrusions 111b are in the same plane as the surface S of the uneven layer 2, and the bottoms of the recesses 111a are located above the surface S of the uneven layer 2 in the thickness direction. It may be located below. In this case, formation of air bubbles in the uneven layer can be suppressed when the decorative sheet is produced.

In the case of FIG. 4A, the portion of the uneven layer 2 protruding from the surface S can be the convex portion 111b, and the portion adjacent to the convex portion 111b and having no uneven layer 2 can be the concave portion 111a. As for the number of concave portions 111a and convex portions 111b, there are four concave portions 111a and three convex portions 111b in FIG. 4A, and the total number of lines is seven. On the other hand, in the case of FIG. 4B, the recesses 111a can be the recessed portions from the surface S, and the protrusions 111b can be the portions of the uneven layer 2 located between two adjacent recesses 111a. As for the number of concave portions 111a and convex portions 111b, there are three concave portions 111a and four convex portions 111b in FIG. 4B, and the total number of lines is seven.

In the case shown in FIGS. 3(b) to 3(d), with respect to the reference line R which is virtually provided between the bottom and the top of the uneven pattern, the portion on the top side of the reference line R is the convex portion 111b. , and a portion adjacent to the convex portion and having no uneven layer 2 can be used as the concave portion 111a.

The number of lines of the uneven pattern in the unit pixel portion is, for example, 3 or more, may be 5 or more, or may be 10 or more. If the number of lines is too small, the intensity of diffracted light and interference light will be weak, and the desired design may not be achieved. On the other hand, the number of lines of the uneven pattern in the unit pixel portion is, for example, 1000 or less, and may be 100 or less. If the number of lines is too large, the unit pixel portion becomes relatively large, and the unit pixel portion becomes easily visible. The number of lines is the total number of the line-shaped recesses and the number of the line-shaped protrusions.

The lengths of the concave portions and the convex portions in the longitudinal direction are appropriately set according to the dimension of the unit pixel portion in plan view. On the other hand, the width of the recess and the width of the protrusion may be equal or different. In the latter case, the ratio of the width of the concave portion to the width of the convex portion is, for example, 1:9 or more and 9:1 or less, or may be 3:7 or more and 7:3 or less. The width of the concave portion and the width of the convex portion are respectively the lengths of the concave portion and the convex portion in a direction perpendicular to the longitudinal direction of the concave/convex pattern when viewed from above. For example, in FIG. 2(b) and FIGS. 3(a) to (e), the width of the concave portion is indicated by _Da , and the width of the convex portion is indicated by _Db .

The pitch (protrusion period) of the uneven pattern is, for example, 0.3 μm or more, may be 0.5 μm or more, may be 3 μm or more, or may be 5 μm or more. If the pitch of the concave-convex pattern is too small, the intensity of the diffracted light and the interference light will be weak, and the desired design may not be achieved. On the other hand, the pitch of the uneven pattern is, for example, 100 μm or less, may be 80 μm or less, may be 60 μm or less, or may be 30 μm or less. The pitch of the uneven pattern is the sum of the width of one protrusion and the width of one recess adjacent to the protrusion. For example, in FIG. 2(b) and FIGS. 3(a) to (e), the pitch of the uneven pattern is indicated by P. As shown in FIG.

The uneven step of the uneven pattern of the unit pixel portion may be, for example, larger than 0.05 μm and smaller than 20 μm, and may be 0.1 μm or more and 3 μm or less. If the unevenness is too small, the intensity of the diffracted light and the interference light becomes weak, and there is a possibility that the desired design cannot be achieved. On the other hand, if the unevenness is too large, it may become difficult to manufacture the decorative sheet. The uneven step is the distance from the top of a protrusion to the bottom of the recess adjacent to the protrusion. For example, in FIG. 2B and FIGS.

Examples of the planar shape of the unit pixel portion include a triangle, a square, a rectangle such as a rectangle, a polygon such as a hexagon, and a circle. The aspect ratio of the unit pixel portion is, for example, 10:1 or more and 1:10 or less, or may be 5:1 or more and 1:5 or less. The aspect ratio of a unit pixel portion is the ratio of two sides that are orthogonal to each other when a minimum square or rectangle circumscribing the unit pixel portion is assumed.

The size of the unit pixel portion in plan view may be any size that allows the unit pixel portion to have a desired number of uneven patterns. The length of one side of the unit pixel portion is, for example, 0.9 μm or longer, may be 1.5 μm or longer, may be 15 μm or longer, or may be 25 μm or longer. On the other hand, the length of one side of the unit pixel portion is, for example, 1 mm or less, may be 800 μm or less, may be 300 μm or less, or may be 80 μm or less. The length of one side of the unit pixel portion is the length of one side of a square or the length of a long side of a rectangle when a minimum square or rectangle circumscribing the unit pixel portion is assumed. In the present disclosure, it is preferable that the unit pixel portion has a rectangular shape in plan view and has a side length of 0.9 μm or more and 1 mm or less.

(ii) Unit pixel portion group The unit pixel portion group is configured by arranging a plurality of unit pixel portions. Furthermore, the unit pixel portion group includes, as unit pixel portions, a first unit pixel portion having an uneven pattern extending along a first axis and a second unit pixel portion having an uneven pattern extending along a second axis. and at least.

The unit pixel portion group may have only the first unit pixel portion and the second unit pixel portion as unit pixel portions, and may further have other one or two or more kinds of unit pixel portions. may These unit pixel portions are preferably adjacent to each other. Adjacent two unit pixel portions means a state in which the two unit pixel portions share the same side or the same vertex. Further, it is preferable that the axes along which the uneven patterns extend intersect with these unit pixel portions.

The first axis in the first unit pixel portion and the second axis in the second unit pixel portion are in an intersecting relationship. For example, in FIG. 5A, the first axis _LA in the first unit pixel portion 11A and the second axis _LB in the second unit pixel portion 11B are in an intersecting relationship. In FIG. 5A, the unit pixel portions 11A and the unit pixel portions 11B are arranged in a checkered pattern.

Let the angle at which the first axis L _A and the second axis L _B intersect be an angle θ ₁₂ . In the present disclosure, the angle at which the Mth axis _LM and the Nth axis _LN intersect is denoted as angle _θMN . The angle θ ₁₂ is usually greater than 0° and 90° or less, may be 5° or more and 85° or less, may be 15° or more and 75° or less, or may be 30° or more and 65° or less. good too. In FIG. 5(a), the angle _θ12 is 90°. The intersecting angle refers to the acute angle among the angles formed by one axial direction and the other axial direction. Intersecting angles in the present disclosure are understood to include manufacturing errors to the extent that they do not unduly impair the effectiveness of the present disclosure. For example, when the crossing angle is X°, it can be understood with a width of X°±2°.

In the unit pixel portion group, the ratio of the number of the first unit pixel portions to the sum of the number of the first unit pixel portions and the number of the second unit pixel portions is, for example, 20% or more and 80% or less. % or more and 70% or less, or 40% or more and 70% or less. The ratio of the number of first unit pixel portions may be 50%.

The unit pixel portion group includes, as unit pixel portions, a third unit pixel portion having an uneven pattern extending along a third axis, in addition to the first unit pixel portion and the second unit pixel portion. good too. In this case, the first to third axes are in a cross relationship. For example, in FIG. 5B, the first axis L _A in the first unit pixel portion 11A, the second axis L B in the second unit pixel portion 11B, and the third axis L _B in the third unit pixel portion 11C. , are in a crossing relationship _with each other.

As described above, the angle θ ₁₂ is usually greater than 0° and 90° or less, may be 5° or more and 85° or less, may be 15° or more and 75° or less, or may be 30° or more and 65° or less. ° or less. Also, the angles θ ₁₃ and θ ₂₃ are preferably within the above ranges. In FIG. 5(b), the angles θ ₁₂ and θ ₁₃ are 60°. Further, when the direction of rotation from the first axis to the second axis is positive with respect to the first axis, it is preferable that the direction of rotation from the first axis to the third axis is negative. For example, in FIG. 5B, the rotation angle of the second axis L _B is +60° and the rotation angle of the third axis L _C is -60° with the first axis L _A as the reference (0°). is.

In the unit pixel portion group, the ratio of the number of the first unit pixel portions to the total number of the first to third unit pixel portions is, for example, 10% or more and 90% or less, or 15% or more and 70% or less. It may be 20% or more and 50% or less. The ratio of the numbers of the second and third unit pixel portions is also preferably within the above range.

The unit pixel portion group may include, in addition to the first to third unit pixel portions, a fourth unit pixel portion having an uneven pattern extending along the fourth axis. In this case, the first to fourth axes are in a cross relationship. For example, in FIG. 5C, the first axis L _A in the first unit pixel portion 11A, the second axis L B in the second unit pixel portion 11B, and the third axis L _B in the third unit pixel portion 11C. and the fourth axis _LD in the fourth unit pixel portion _11D are in an intersecting relationship.

As described above, the angle θ ₁₂ is usually greater than 0° and 90° or less, may be 5° or more and 85° or less, may be 15° or more and 75° or less, or may be 30° or more and 65° or less. ° or less. Any angles formed by the first to fourth axes are also preferably within the above range. In FIG. 5(c), the angle θ ₁₂ is 90° and the angles θ ₁₃ and θ ₁₄ are 45°. Further, when the direction of rotation from the first axis to the third axis is positive with respect to the first axis, it is preferable that the direction of rotation from the first axis to the fourth axis is negative. For example, in FIG. 5(c), the rotation direction of the third axis L _C is +45° and the rotation direction of the fourth axis L _D is −45° with the first axis L _A as the reference (0°). is. The direction of rotation of the second axis may be positive or negative. For example, in FIG. 5(c), the rotational direction of the second axis LB is 90 degrees with _the first axis _LA as the reference (0 degrees).

In the unit pixel portion group, the ratio of the number of the first unit pixel portions to the total number of the first to fourth unit pixel portions is, for example, 5% or more and 90% or less, and 10% or more and 60% or less. It may be 15% or more and 40% or less. The ratio of the number of the second to fourth unit pixel portions is also preferably within the above range.

In the present disclosure, as the decorative shape of the point light source, one type of shape may be obtained, two or more types of shapes may be obtained, or three or more types of shapes may be obtained. Furthermore, when two or more shapes can be obtained, it is preferable that the patterns for obtaining those shapes are arranged continuously in the unit pixel portion group. For example, when the unit pixel portion group continuously has the patterns shown in FIGS. 5A to 5C, in the pattern region shown in FIG. 5A, a decorative shape in which light extends in four directions is obtained. In the pattern area shown in FIG. 5(b), a decorative shape in which light extends in six directions is obtained, and in the pattern area shown in FIG. 5(c), a decorative shape in which light extends in eight directions is obtained. In the present disclosure, since a unit pixel portion group is manufactured using a plurality of unit pixel portions, by adjusting the arrangement of the unit pixel portions, it is possible to easily create a decorative sheet in which the changing portions (joints) of the decorative shape are less visible. obtained in The decorative sheet according to the present disclosure preferably has at least two types of shapes of four directions, six directions, and eight directions as the decorative shape of the point light source.

The unit pixel portion group has a plurality of unit pixel portions, and the shape of the uneven pattern in each unit pixel portion may be the same or different. In the former case, for example, each unit pixel portion may be the same except for the axial direction in which the concave-convex pattern extends. Further, the planar view shape of each unit pixel portion may be the same or different.

For example, a part Z of the unit pixel portion group shown in FIG. 1B described above is composed of a plurality of unit pixel portions 11A and 11B having the same square planar shape and the same uneven pattern. . On the other hand, the part Z of the unit pixel portion group shown in FIG. 6 includes a first unit pixel portion 11A having a triangular shape in plan view, a second unit pixel portion 11B having a square shape, and a third unit pixel portion having a pentagonal shape. and a pixel portion 11C. In FIG. 6, the first unit pixel portion 11A, the second unit pixel portion 11B, and the third unit pixel portion 11C have the same uneven pattern.

In FIG. 6, the first unit pixel portion 11A has an uneven pattern 111A extending along the first axis _LA . The second unit pixel portion 11B has an uneven pattern 111B extending along the second axis _LB. The third unit pixel portion 11C has an uneven pattern 111C extending along the third axis _LC . Also, the first axis L _A , the second axis L _B and the third axis L _C are in an intersecting relationship. In FIG. 6, the angle θ ₁₂ at which the first axis _LA and the second axis _LB intersect, the angle θ ₂₃ at which the second axis _LB and the third axis _LC intersect, and the first axis L An example is shown where the angle θ ₁₃ at which _A and the third axis L _C intersect is 60° each. As shown in FIG. 6, the shape of the unit pixel portion in plan view does not have to be regular.

In the unit pixel portion group, the planar-view shapes of two adjacent unit pixel portions may be congruent with each other, or may not be congruent with each other. Having a congruent relationship means having a "congruent" relationship in mathematics (geometry). That is, when two adjacent unit pixel portions are congruent, they have the same plan view shape (peripheral shape) and size. Note that the uneven pattern in each pixel portion may be the same or different. For example, in FIG. 7, all the unit pixel portions (11A to 11D) forming the unit pixel portion group are in a congruent relationship.

Also, the planar view shape of the unit pixel portion group in the present disclosure may be, for example, a congruent triangle. For example, in FIG. 8A, the planar-view shapes of the first unit pixel portion 11A and the second unit pixel portion 11B are congruent isosceles right triangles, and the first unit pixel portion 11A and the second unit pixel portion 11A and the second unit pixel portion 11B A square collective pixel portion is formed by using two unit pixel portions 11B. In such a square aggregated pixel portion, a decorative shape in which light extends in four directions is obtained as in FIG. 5(a).

Further, for example, in FIG. 8B, the planar view shapes of the first unit pixel portion 11A, the second unit pixel portion 11B, and the third unit pixel portion 11C are congruent right isosceles with a vertical angle of 60°. It is triangular, and by using two each of the first unit pixel portion 11A, the second unit pixel portion 11B, and the third unit pixel portion 11C, a regular hexagonal aggregate pixel portion is formed. In such a regular hexagonal aggregated pixel portion, a decorative shape in which light extends in six directions is obtained as in FIG. 5B.

Further, for example, in FIG. 8C, the plan view shapes of the first unit pixel portion 11A, the second unit pixel portion 11B, the third unit pixel portion 11C, and the fourth unit pixel portion 11D each have an apex angle of 45° congruent isosceles right triangle, and two first unit pixel portions 11A, second unit pixel portions 11B, third unit pixel portions 11C, and fourth unit pixel portions 11D are used. , forming a regular octagonal collective pixel portion. In such a regular octagonal collective pixel portion, a decorative shape in which light extends in eight directions is obtained, as in FIG. 5C.

On the other hand, in the unit pixel portion group, the two adjacent unit pixel portions do not have to have a congruent relationship in plan view. For example, in FIG. 6, all the unit pixel portions (11A to 11C) forming the unit pixel portion group are not in a congruent relationship. Further, in the unit pixel portion group, when the planar view shapes of two adjacent unit pixel portions are not in a congruent relationship, a similar relationship is also included. For example, in FIG. 9, the planar view shape of the first unit pixel portion 11A and the planar view shape of each of the second to fourth unit pixel portions 11B to 11D have a similar relationship.

A plurality of unit pixel portions are usually arranged without any space therebetween. may be arranged with

(2) Configuration of Concavo-convex Layer Examples of materials for the concavo-convex layer include resins such as thermoplastic resins and curable resins. Examples of curable resins include resins obtained by heating and curing thermosetting resins (thermosetting resins), and resins obtained by curing ionizing radiation resins by irradiation with ionizing radiation (ionizing radiation curable resins). Here, "ionizing radiation" refers to radiation having energy quanta capable of polymerizing or cross-linking molecules among electromagnetic waves and charged particle beams. , α-rays, ion beams, and other charged particle beams. Examples of ionizing radiation curable resins include ultraviolet curable resins and electron beam curable resins.

Specific examples of materials for the uneven layer include polyethylene terephthalate, polycarbonate, acrylic resin, cycloolefin resin, polyester resin, polystyrene resin, and acrylic styrene resin.

The thickness of the uneven layer is, for example, 1 μm or more, and may be 20 μm or more. If the uneven layer is too thin, it may not be possible to form a desired unit pixel portion. On the other hand, the thickness of the uneven layer is, for example, 200 μm or less, and may be 50 μm or less. If the uneven layer is too thick, there is a possibility that the three-dimensional formability will deteriorate and the cost will increase. The thickness of the uneven layer is, for example, the portion indicated by H in FIG. 2(b).

2. Substrate The substrate is a layer that supports the uneven layer, and has transparency to the extent that light from a point light source can be visually recognized.

Examples of materials for the substrate include resins such as polyethylene terephthalate, polycarbonate, acrylic resin, cycloolefin resin, polyester resin, polystyrene resin, and acrylic styrene resin.

The thickness of the substrate is, for example, 25 μm or more, and may be 50 μm or more. On the other hand, the thickness of the base material varies depending on the mode of use of the decorative sheet, but is, for example, 700 μm or less, may be 500 μm or less, or may be 200 μm or less. For the purpose of improving adhesion, the surface of the base material on the uneven layer side may be subjected to an adhesion-promoting treatment such as corona discharge treatment or ozone treatment, or a surface treatment such as primer coating.

Further, in the decorative sheet of the present disclosure, the concave-convex layer and the substrate may be integrated. That the uneven layer and the base material are integrated means that the uneven layer 2 and the base material 1 are a single layer made of the same material, as illustrated in FIG. 10 .

3. Decorative Sheet The decorative sheet in the present disclosure has transparency to the extent that light from a point light source can be visually recognized. The total light transmittance of the decorative sheet is, for example, 10% or more, may be 50% or more, or may be 90% or more. The total light transmittance is measured in accordance with JIS K 7361-1 (Plastic—Testing method for total light transmittance of transparent materials). For the measurement, for example, an ultraviolet/visible/near-infrared spectrophotometer (Shimadzu UV-3600) and an integrating sphere accessory (ISR-3100) can be used. As a standard plate, for example, Spectralon (manufactured by Labsphere, Inc., USA) (manufactured by Teflon (registered trademark)) can be used. In the present disclosure, it is preferred that the substrate and the uneven layer each have the above-described total light transmittance.

Also, the decorative sheet includes at least a substrate and an uneven layer. The decorative sheet may further comprise any other layer as required. Other layers include, for example, a protective layer that protects the uneven layer, a printed layer, a light-shielding pattern layer, and a primer layer. Also, the decorative sheet may have an adhesive layer on the opposite side of the substrate from the uneven layer. Moreover, the decorative sheet in the present disclosure is preferably used together with a point light source, as will be described later.

A method for manufacturing the decorative sheet is not particularly limited. For example, when the composition for forming the uneven layer contains an ionizing radiation curable resin, the composition is applied to one surface of the substrate to form a coating layer, and then the uneven pattern of the unit pixel portion is formed. A decorative sheet can be obtained by pressing an original plate having a pattern corresponding to the surface onto the coating layer and irradiating it with ionizing radiation. Further, for example, when the composition for forming the uneven layer contains a thermoplastic resin, the decorative sheet can be obtained by pressing the original plate while extrusion-laminating the composition onto the substrate surface. can be done.

B. Module FIG. 11 is a schematic cross-sectional view illustrating a module in the present disclosure. A module 100 shown in FIG. 11 has a decorative sheet 10 and a light source 20 arranged with a space between the decorative sheet 10 and the decorative sheet 10 . The decorative sheet 10 is formed on the surface of the support member 30 having transparency on the point light source 20 side, and the point light source 20 is fixed to the fixing member 40 .

According to the present disclosure, by using the decorative sheet described above, it is possible to obtain a module with few defects in the concave-convex pattern.

1. Decorative Sheet The decorative sheet in the present disclosure has the same content as described in "A. Decorative Sheet" above, so the description is omitted here.

2. Point light source The point light source in the present disclosure is arranged with a space between it and the decorative sheet. A typical example of a point light source is a light emitting diode (LED) light source. The LED light source may have a single-color LED element, or may have a multi-color LED element. Examples of LED elements include red LED elements, green LED elements, and blue LED elements. The size of the LED element is preferably micro-sized, for example, 10 μm square or more and 100 μm square or less, or 50 μm square or more and 100 μm square or less.

Examples of the plane view shape of the point light source include rectangles such as squares and rectangles. The length of one side of the point light source is, for example, 0.5 mm or more and 5.0 cm or less, and may be 0.8 mm or more and 3.0 cm or less.

3. Module A module in the present disclosure has at least a decorative sheet and a point light source. The module may have a support member that supports the decorative sheet, as shown in FIG. 11, for example. A support member usually has transparency. Examples of the support member include resin and glass. The shape of the support member is not particularly limited, and may be flat or curved.

Further, the decorative sheet may be arranged on the side of the point light source with respect to the support member, or may be arranged on the side opposite to the point light source. The former has the effect that the support member protects the decorative sheet, so that damage to the decorative sheet can be suppressed. On the other hand, the latter has the effect that the visual recognition shape of the point light source in the existing module can be easily decorated, for example, by retrofitting the decorative sheet to the existing module. Further, an adhesive layer may be formed between the decorative sheet and the support member to bond them together.

The module may have a fixing member for fixing the point light source, as shown in FIG. 11, for example. Examples of the fixing member include metal, resin, and glass. The fixing member may or may not have transparency.

A typical example of a module in this disclosure is a lighting fixture. The lighting equipment can be used for various purposes such as household use, home appliance use, automobile interior use, and amusement use.

The present disclosure is not limited to the above embodiments. The above embodiment is an example, and any device that has substantially the same configuration as the technical idea described in the claims of the present disclosure and produces the same effect is the present invention. It is included in the technical scope of the disclosure.

[Examples 1 to 5]
(Preparation of original transcription plate)
On a copper-plated iron cylinder, a fully automatic laser gravure plate-making system (NEWFX3 manufactured by Think Laboratories) was used to form a partitioned region having a line-shaped concave-convex pattern to obtain a transfer original plate. The partitioned area corresponds to a portion forming a unit pixel portion of the decorative sheet. Three 50 mm square pattern areas were continuously formed on the original transfer plate. The first pattern area is the pattern area (0°, 90°) shown in FIG. 5A, and the second pattern area is the pattern area (0°, ±60°) shown in FIG. 5B. ), and the third pattern area was the pattern area (0°, ±45°, 90°) shown in Fig. 5(c).

(Production of decorative sheet)
An ultraviolet curable resin having the following composition is applied to one surface of a base material (PET film, Cosmoshine manufactured by Toyobo Co., Ltd.) to form a resin layer, and the cylinder is pressed against the resin layer, and the side of the base material is pressed. UV irradiation (wavelength: 365 nm, irradiation energy: 170 mJ/cm ² ) was performed to cure the UV curable resin, thereby forming an uneven layer. After that, the uneven layer was peeled off from the cylinder to obtain a decorative sheet.
・Urethane acrylate … 35% by mass
・1,6-Hexanediol diacrylate … 35% by mass
・ Pentaerythritol triacrylate ... 10% by mass
・Vinylpyrrolidone ... 15% by mass
・ 1-hydroxycyclohexyl phenyl ketone ... 2% by mass
・Benzophenone … 2% by mass
・Polyether-modified silicone oil … 1% by mass

Table 1 shows the details of the unit pixel portion in the decorative sheet. The number of lines is the total number of concave portions and convex portions. For example, if the number of lines is 10, there are 5 convex portions and 5 concave portions.

[Comparative Example 1]
A concave-convex pattern was formed on a copper plate by cutting using an ultra-precision processing machine (ROBONANO manufactured by Fanuc) to obtain a transfer original plate. Three 50 mm square pattern areas were continuously formed on the original transfer plate. The first pattern area is the pattern area (0°, 90°) shown in FIG. 12(a), and the second pattern area is the pattern area (0°, ±60°) shown in FIG. 12(b). ), and the third pattern area was the pattern area (0°, ±45°, 90°) shown in FIG. 12(c). A decorative sheet was obtained in the same manner as in Example 1, except that the obtained transfer original plate was used. The uneven step in Comparative Example 1 refers to the height from the base to the vertex of the triangular pyramid. Further, the uneven period in Comparative Example 1 refers to the interval between adjacent cutting grooves.

[evaluation]
The decorative sheets obtained in Examples 1 to 5 and Comparative Example 1 were evaluated as follows.

(Decorative shape of point light source)
The decorative sheets obtained in Examples 1 to 5 and Comparative Example 1 were cut into 100 mm squares to obtain samples. The resulting sample was placed 50 cm away from a point light source (white LED) to identify the decorative shape of the point light source.

In the first pattern area (the pattern area shown in FIG. 5A), the shape of the point light source was decorated like a cross in four directions. Similarly, in the second pattern area (the pattern area shown in FIG. 5B), the shape of the point light source was decorated in six directions. Similarly, in the third pattern area (pattern area shown in FIG. 5(c)), the shape of the point light source was decorated in eight directions. Also in Comparative Example 1, the point light sources were decorated in four directions, six directions, and eight directions, respectively.

(pattern defect)
The decorative sheets obtained in Examples 1 to 5 and Comparative Example 1 were cut into 100 mm squares to obtain samples. The number of visually identifiable defects was counted for the obtained samples. Evaluation criteria are as follows.
○: No visible defects ×: Visually visible defects

Table 1 shows the results. As shown in Table 1, in Examples 1 to 5, no pattern defects occurred. On the other hand, in Comparative Example 1, pattern defects occurred. As described above, in the present disclosure, a decorative sheet with few defects in the concave-convex pattern is obtained by fabricating a unit pixel portion group using a plurality of unit pixel portions.

(State of changing part of decorative shape)
The decorative sheets obtained in Examples 1 to 5 and Comparative Example 1 were cut into 100 mm squares to obtain samples. The obtained sample was placed 50 cm away from a point light source (white LED), and the unit pixel portion group was observed from a position 50 cm above. The test environment was set at an illuminance of 400 lux (equivalent to a bright office). Evaluation criteria are as follows. There were 10 subjects (from 20's to 60's), and the number of people who could visually recognize the changing part (joint) of the decorative shape was counted, and the following judgments were made.
○: 3 or less ×: 4 or more

Table 1 shows the results. As shown in Table 1, in Examples 1 to 5, the changed portion of the decorative shape was hardly visible. On the other hand, in Comparative Example 1, the changing portion (joint) of the decorative shape was easily visible. In this way, for example, even when the decorative shape is changed continuously, by forming a unit pixel portion group using a plurality of unit pixel portions, the changing portion (joint) of the decorative shape is less visible. A decorative sheet was obtained.

DESCRIPTION OF SYMBOLS 1... Base material 2... Concavo-convex layer 10... Decorative sheet 11... Unit pixel part 111... Concavo-convex pattern

Claims (27)

A decorative sheet having transparency,
a substrate;
a concavo-convex layer located on one surface side of the base material and having, on its surface, a group of unit pixel portions in which a plurality of unit pixel portions are arranged;
with
The unit pixel portion has an uneven pattern in which line-shaped convex portions and concave portions are alternately arranged,
The unit pixel portion group includes, as the unit pixel portion,
a first unit pixel portion having the uneven pattern extending along the first axis;
a second unit pixel portion having the uneven pattern extending along the second axis;
with at least
wherein the first axis and the second axis are in a crossed relationship;
A decorative sheet from which two or more types of shapes can be obtained as the decorative shape of a point light source . The decorative sheet according to claim 1, wherein an angle _θ12 at which the first axis and the second axis intersect is greater than 0° and less than or equal to 90°. 3. The decorative sheet according to claim 2, wherein said angle _θ12 is 90°. the unit pixel portion group includes, as the unit pixel portion, a third unit pixel portion having the uneven pattern extending along a third axis;
4. The decorative sheet according to any one of claims 1 to 3, wherein said first axis, said second axis and said third axis are in an intersecting relationship. An angle θ ₁₂ at which the first axis and the second axis intersect, and an angle θ ₁₃ at which the first axis and the third axis intersect are each greater than 0° and less than or equal to 90°. , The decorative sheet according to claim 4. 6. The decorative sheet according to claim 5, wherein said angle _θ12 and said angle _θ13 are 60°. the unit pixel portion group includes, as the unit pixel portion, a fourth unit pixel portion having the uneven pattern extending along a fourth axis;
The decoration according to any one of claims 4 to 6, wherein the first axis, the second axis, the third axis and the fourth axis are in an intersecting relationship. sheet. The angle θ ₁₂ at which the first axis and the second axis intersect, the angle θ ₁₃ at which the first axis and the third axis intersect, and the first axis and the fourth axis are 8. The decorative sheet according to claim 7, wherein each intersection angle _θ14 is greater than 0° and less than or equal to 90°. 9. The decorative sheet according to claim 8, wherein the angle [theta] ₁₂ is 90[deg.] and the angle [theta] ₁₃ and the angle [theta] ₁₄ are 45[deg.]. 10. The decorative sheet according to any one of claims 1 to 9 , wherein the unit pixel portion has a rectangular shape in plan view. The decorative sheet according to any one of claims 1 to 10 , wherein the length of one side of the unit pixel portion is 0.9 µm or more and 1 mm or less. 12. The decorative sheet according to any one of claims 1 to 11 , wherein the number of lines of the uneven pattern in the unit pixel portion is three or more. 13. The decorative sheet according to any one of claims 1 to 12 , wherein the pitch of the uneven pattern in the unit pixel portion is 0.3 µm or more and 100 µm or less. a base material; and an uneven layer located on one surface side of the base material and having, on its surface, a group of unit pixel portions in which a plurality of unit pixel portions are arranged;
The unit pixel portion has an uneven pattern in which line-shaped convex portions and concave portions are alternately arranged,
The unit pixel portion group includes, as the unit pixel portions, a first unit pixel portion having the uneven pattern extending along the first axis and a second unit pixel portion having the uneven pattern extending along the second axis. and at least a unit pixel portion,
a transparent decorative sheet in which the first axis and the second axis are in an intersecting relationship ; and
A module having a point light source arranged with a space between it and the decorative sheet. 15. The module of claim 14, wherein the angle θ ₁₂ at which the first axis and the second axis intersect is greater than 0° and less than or equal to 90°. 16. A module according to claim 15, wherein said angle [theta] ₁₂ is 90[deg.]. the unit pixel portion group includes, as the unit pixel portion, a third unit pixel portion having the uneven pattern extending along a third axis;
17. The module of any one of claims 14-16, wherein the first axis, the second axis and the third axis are each in a crossed relationship. An angle θ ₁₂ at which the first axis and the second axis intersect , and an angle θ ₁₃ at which the first axis and the third axis intersect are each greater than 0° and less than or equal to 90°. 18. The module of claim 17 . the angle θ ₁₂ and said angle θ ₁₃ is 60°. the unit pixel portion group includes, as the unit pixel portion, a fourth unit pixel portion having the uneven pattern extending along a fourth axis;
20. The module of any one of claims 17-19, wherein the first axis, the second axis, the third axis and the fourth axis are each in a crossed relationship. the angle θ at which the first axis and the second axis intersect ₁₂ , the angle θ at which the first axis and the third axis intersect ₁₃ , and the angle θ at which the first axis and the fourth axis intersect ₁₄ are each greater than 0° and less than or equal to 90°. the angle θ ₁₂ is 90°, and the angle θ ₁₃ and said angle θ ₁₄ is 45°. 23. A module according to any one of claims 14 to 22, wherein more than one type of shape is obtained as the decorative shape of the point light source. 24. The module according to any one of claims 14 to 23, wherein the unit pixel portion has a rectangular planar shape. 25. The module according to any one of claims 14 to 24, wherein the length of one side of said unit pixel portion is 0.9 [mu]m or more and 1 mm or less. 26. The module according to any one of claims 14 to 25, wherein the number of lines of said uneven pattern in said unit pixel portion is three or more. 27. The module according to any one of claims 14 to 26, wherein the pitch of said uneven pattern in said unit pixel portion is 0.3 [mu]m or more and 100 [mu]m or less.

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